Air pump



May 2, 1933 T. L. PATRICK 1,906,405

AIR PUMP Filed May 6, 1929 Qs, www

Patented May 2, 1933 UNITED STATES PATENT oFFlcE Tnsononn L. PATRICK, orCARDWELL, MONTANA, AssIGNoR or ONE-HALF To .ToHN

' TnUzzoLINo, or BUTTE, MONTANA i Ara PUMP Application led May 6,

This invention relates to air pumps and more especially to pumps of thedouble. acting type, and my objectisto produce aV simple, strong,durable and eiiicient pumpv which will enable motorists to quicklyandeasily effect inflation of tires or supply air under pressure forother purposes.

lVith this obj ect in view the invention consists in certain novel anduseful features of construction and combinations of parts as hereinafterdescribed and claimed; and in order that it may be fully understood,reference is to be had to the accompanying drawing, in which: Y n

Figure 1 is a view partly in elevationand partly in central verticalsection, of a double acting pump embodying the invention.

Figure 2 is a horizontal .section on the line II-Il of Figure 1.

Figure 3 is a horizontal section on the line IIL-III of Figure 1.

Figure 4 is a horizontal section on the line IV-IV of Figure 1.

Referring now tothe drawing in detail, 1

indicates a suitable base provided in its upper side with a pair ofcircular recesses 2. It is also formed with a passage 8 connecting thetwo recesses and a passage 4 leading upward from passage 3, to a pointexterior to the said recesses.

A pair of cylinders 5 tit and are secured at their lower ends in therespective recesses with an air-tight relation. Secured to the upperends of the cylinders is a cap or head,

composed of a pair of plates 6 and 7 spaced apa-rt by a marginal gasket8, and gaskets 9 are interposed between the head and the cylinders. Thegasket 8 establishes an air-tight relationship between the plates of thehead,

and by spacing said plates apart provides a passage or chamber 10 forthe head. The gaskets 9 establish an air-tight relationship between thehead and the cylinders, and the lower plate of the head is provided withpassages 11 which respectively connect the chambers of the cylinderswith the chamber 10 of the head.

Connecting the base and head between the cylinders,\is a pipewayconsisting of pipe sections 13 and k14 united by a union l5.

1929. Serial No. 360,785..

Pipe section 13 is equipped with a valve casing 16, containing a ballvalve or plug 17 and yclose communication betweeny the valve cas-` ingand the air passage or chamber v10. A similar valve casing 19 isprovided inthe lower end of pipe section 14 and contains a ball valve orplug 20 and a spring 21, the lat ter acting to normally maintain theball valve 20 seated and closing communication between the valve casingand air passage 3. The pipe section 14 is also provided with a coupling22 having a nozzle 23 for-engagement' by a' flexible hose connection,not shown, to supply air to a pneumatic tire or other object. l

The upper plate ofthe head is provided in line with the axial center ofeach cylinder, with any suitable packing gland 23a, and extendingslidingly through said packing' glands and the head, are tubular pistonrods or stems 24. vEach piston rod or stem is equipped at its lower endwith a pair of spaced pistons 25 and 26 of the cup-leather or equivalenttype, the pistons 25 facing downwardly and the pistons 26 facingupwardly, and between said pistons the respective stems are eachprovided with an orifice 27, it being understood that the stemsbelowsaid orifices are closed. The upper ends of the stems are open tothe atmosphere as at 24aandA they are connected by a handle 28. y

j To `operate the pump, the handle is grasped and whenpvpressedldownwardly imparts corresponding movement to the pistons. This effectsexpansion of pistons 25 which1force the air from the lower ends ofthecylinders into the passage 3 and upward. within the pipeway, thepressure thus produced unseating the ball valve 20 vto permit the air`to pass into the valve casing 19 andthrough the stem of the coupling 22,becausei'at this time the'ball valve 17 is seated, not'only because thespring 18 normally holds said valve seated as explained, but becauseyair passing up through the pipeway cooperates with said spring in saidaction, and also because the downward movement of the pistons tends tocreate-a vacuum in the 'upper ends of the cylinders and the passage 10to cooperate in the tight seating of said ball valve 17. As the downwardmovement of the pistons with valve 17 seated, tends to create a vacuumabove the pistons 25, there follows collapsing move-ment of the upperpistons 26 and results in 'air entering the upper ends of the pistonstems or rods and passing through pass through orifices 11 and thepasage 10,

and from the latter downward through pipe section 13 into the valvecasing 16, this action unseating the ball valve 17 so that the air canpass downward through the pipeway to the coupling 22,v it beingunderstood that vas the upward movement of the pistonsstarts, the upwardpressure on the ball valve 2O is removed to permit said ball valve tobeinstantly seated under the pressure of its spring 21 and the suctionalpull created in the lower ends of the cylinders. .v

Upon the following downward and upward movements of the handle, theactions just described arenrepeated. It will thus'be seen that with eachstroke of the pistons air is discharged from the coupling'through itsstem 28, -and that iny practice a constant stream of air is passing fromthe coupling. The pump is therefore a double acting pump and will enablean operator to charge an infiatable tire or other objectI quickly andeasily. K

From the above description it will be apparent Vthat I 'have produced anair pump pos"- sessing the features of advantage set forth as desirablein the statement of, the object of the invention, and' which issusceptible of each cylinder for alternately forcing air t0- ward theopposite ends of the cylinders, hollow piston rods carrying said spacedpistons, said rods having their bores communicating with the atmosphereat their upper ends and vbeing closed at their lower ends, and cross'way, one adapted to o'pen under air pressure `from the cylinder at oneend thereof, and the other adapted to open under pressure of air fromthe cylinderat the other end thereof, an-air-discharge connection fromthe pipeway between said valves, a pair of 'simul- 'taneously operablespaced pistons inthe cylinder for alternately forcing air toward-theopposite ends of the cylinder, a hollow piston rod carrying said pistonsand being open to the atmosphere at its upper end and closed at itslower end, and a cross bore Acofnn'ecting said piston rod bore above itsclosed lower end w'vith the space between said pair' of pistons. i

Intestiinny whereof 'I aiXmy signatu THEODOR'E L. PATRICK.

modifica-tion in various particulars withinV the .principle ofVconstruction involved and the spirit and scope of the appended claims..

Iyclaimf: 1. Ana-.ir pump comprising arbase, a pair of cylinders securedon the base, a head closing the upper ends*v of the cylinders, a pipewaycommunicating at its opposite ends with the corresponding ends of thecylinders, a

` pair of normally-closed check valves for the pi-peway, one adapted toopen under air pressure fromthe cylinders at one end thereof and theother adapted to open under pressure of air from the cylinders at theother end thereof, an air-discharge connection for the pipeway betweenthe said valves, a. pair of simultaneously operable spaced pistons in

